Return-Path: X-Spam-DCC: paranoid 1480; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_MESSAGE,RATWARE_GECKO_BUILD,SPF_PASS autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u9CIv11o023117 for ; Wed, 12 Oct 2016 20:57:01 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1buOf9-0006SC-KQ for rs_out_1@blacksheep.org; Wed, 12 Oct 2016 19:53:59 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1buOf9-0006S3-9m for rsgb_lf_group@blacksheep.org; Wed, 12 Oct 2016 19:53:59 +0100 Received: from smtpout.karoo.kcom.com ([212.50.160.34]) by relay1.thorcom.net with esmtp (Exim 4.87) (envelope-from ) id 1buOf7-0001E1-IL for rsgb_lf_group@blacksheep.org; Wed, 12 Oct 2016 19:53:58 +0100 X-IronPort-AV: E=Sophos;i="5.31,336,1473116400"; d="scan'208,217";a="177358717" Received: from unknown (HELO [127.0.0.1]) ([109.176.246.47]) by smtpout.karoo.kcom.com with ESMTP; 12 Oct 2016 19:53:55 +0100 Message-ID: <57FE86C5.3080408@lineone.net> Date: Wed, 12 Oct 2016 19:53:57 +0100 From: LineOne User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:31.0) Gecko/20100101 Thunderbird/31.1.2 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <57FD3F9F.80409@lineone.net> <3018579.iHz3xfyXX4@x220> In-Reply-To: <3018579.iHz3xfyXX4@x220> X-Scan-Signature: 29f208b223fe7a2cb359508e38e2ea2d Subject: Re: LF: Audio link Content-Type: multipart/alternative; boundary="------------060201060805000900080901" X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.56 on 10.1.3.11 Content-Length: 6559 Status: O X-Status: X-Keywords: X-UID: 9050 This is a multi-part message in MIME format. --------------060201060805000900080901 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Hello Claudio. Any combination of grounding wire, or no wire, makes no difference, the QRM is directly radiated. If you see my "shack" there's just enough room to sit by the desk so I can't rearrange equipment any better. "Cosy" would be a nice description. The laptop is usually OK but it is charged by time switch about every 2.5 hours and when fully charged, if the timer is still, on it can wipe 10 to 20dB s/n off the signal in spite of having a linear charger. 73, Hugh, M0DSZ On 12/10/2016 15:37, Claudio Pozzi wrote: > > On Tuesday 11 October 2016 20:38:07 you wrote: > > > To avoid having laptop running in the shack, which occasionally > > > produces some QRM, I can send received audio from the shack to a > > > desktop computer in the house on a twisted telephone pair. This works > > > but any wire connection between shack and this desktop introduces some > > > spurious signals on 136khz even if I use an audio isolating transformer. > > > > > The AC 230 power supply in the shack and the desktop computer > grounding wire are equipotential, share the same grounding system? > > 73 de Claudio ik2pii > > > > > ---- > ZE-Light e ZE-Pro: servizi zimbra per caselle con dominio email.it, > per tutti i dettagli clicca qui > > > Sponsor: > Registra i domini che desideri ed inizia a creare il tuo sito web > Clicca qui > --------------060201060805000900080901 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: 8bit Hello Claudio.

Any combination of grounding wire, or no wire, makes no difference, the QRM is directly radiated. If you see my "shack" there's just enough room to sit by the desk so I can't rearrange equipment any better. "Cosy" would be a nice description.
The laptop is usually OK but it is charged by time switch about every 2.5 hours and when fully charged, if the timer is still, on it can wipe 10 to 20dB s/n off the signal in spite of having a linear charger.

73, Hugh, M0DSZ

On 12/10/2016 15:37, Claudio Pozzi wrote:

On Tuesday 11 October 2016 20:38:07 you wrote:

> To avoid having laptop running in the shack, which occasionally

> produces some QRM, I can send received audio from the shack to a

> desktop computer in the house on a twisted telephone pair. This works

> but any wire connection between shack and this desktop introduces some

> spurious signals on 136khz even if I use an audio isolating transformer.

>

The AC 230 power supply in the shack and the desktop computer grounding wire are equipotential, share the same grounding system?

73 de Claudio ik2pii

----
ZE-Light e ZE-Pro: servizi zimbra per caselle con dominio email.it, per tutti i dettagli clicca qui

Sponsor:
Registra i domini che desideri ed inizia a creare il tuo sito web
Clicca qui

--------------060201060805000900080901--